The original is only 1422x948 at 72dpi. It won't enlarge well. Since you have a negative, your best results will come from having the negative scanned at high resolution, then the image adjusted as necessary digitally. I've been having trouble getting good prints lately, until I found
Montclair Photo. Tell them you're a pro and want Steven to print the enlargement (this is a wink-wink thing). You'll have to mail them the negative. My monitor needs to be calibrated, but to me this looks like what I'd go for. If you want the date in there, I'd suggest removing the red stamp and typing in something nice with Photoshop.